Why doesn't DeadZone(Trigger) work?

Question

Unity

public class HereDead : MonoBehaviour
{
    public GameObject Player;
    public GameObject Ragdoll;
    void onTriggerEnter(Collider other)
    {
        if (other.tag == "DeadZone")
        {
            Player.SetActive(false);
            Ragdoll.SetActive(true);
            Instantiate(Ragdoll, transform.position, transform.rotation);
        }
    }
}

Cube has Trigger and Tag DeadZone.

Answer 1

Isn't it necessary to define Player and Ragdoll ( respectively, in GameObject.Find specify their name on the stage )

public class HereDead : MonoBehaviour
{
    public GameObject Player;
    public GameObject Ragdoll;
    void onTriggerEnter(Collider other)
    {
        if (other.tag == "DeadZone")
        {
            Player = GameObject.Find("Player");
            Ragdoll = GameObject.Find("Ragdoll");
            Player.SetActive(false);
            Ragdoll.SetActive(true);
            Instantiate(Ragdoll, transform.position, transform.rotation);
        }
    }
}